Name_____________________________________________________
Chemistry Review
1. An element in group 8____
a. Has a full outer shell of electrons
b. Tends not to bond with other atoms
c. Is a non-metal
d. All of the above
2. As you move down a group and across a period (to the RIGHT) what happens to the mass of the elements?
a. It decreases
b. It increases
c. There is no trend for change in mass
d. It stays exactly the same
3. The smallest particles that make up all matter are called
a. Elements
b. Atoms
c. Cells
d. Pieces
4. Vinegar is added to baking soda and bubbles of carbon dioxide rapidly form.
A cloudy liquid is left behind. What are products in this chemical reaction?
a. vinegar and the cloudy liquid
b. vinegar and baking soda
c. carbon dioxide and baking soda
d. carbon dioxide and the cloudy liquid
5. How does the number and kind of atoms involved as reactants in a chemical
reaction compare to the number and kind of atoms in the products?
a. there are more atoms that react
b. there are more atoms that are produced
c. there are the same number and kind of each
d. it varies from one reaction to another
Use this equation to answer the next 4 questions:
Lead Nitrate + Sodium Iodide Sodium Nitrate + Lead Iodide
6. What are the reactants in this equation?
a. lead nitrate, sodium nitrate
b. sodium iodide, lead iodide
c. sodium nitrate, lead iodide
d. lead nitrate, sodium iodide
7. What has happened to the atoms of the reactants?
a. They have recombined to form the products.
b. They have changed into new atoms.
c. They have new names and places.
d. Some have been lost to the environments.
8. What type of reaction is this?
a. Single replacement
b. Double replacement
c. Synthesis
d. Decomposition
9. If four carbon atoms undergo a chemical reaction with oxygen to form CO2
molecules, how many carbon atoms will be found in the product?
a. one
b. two
c. three
d. four
10. The Law of Conservation of Mass states that matter is not gained or lost in a
chemical reaction. Which of the following correctly restates this law? In a
chemical reaction…
a. the amount of mass of the reactants will equal the mass of the products.
b. the amount of mass is equal to the sum of the reactants and products.
c. matter is gained and lost in depending on how much energy is added.
d. matter is gained and lost but energy is conserved.
11. A student uses clay to model the conservation of mass. First, she weighs a
block of clay on a balance. Then she molds the clay into a different shape,
without adding or removing clay. She weighs it again. How will her results
model this law?
a. they will show that the shape has changed, but the weight is the same.
b. they will show that the shape has changed and the weight has also.
c. they will show the changing shape has changed the weight of the clay.
d. they will show that the larger the shape, the greater the weight.
12. What is the approximate mass of an atom with 9 protons and 10 neutrons?
a. 90
b. 19
c. 1
d. 18
13. How many neutrons does an atom with atomic number 12 and mass of 24 grams have?
a. 9
b. 10
c. 11
d. 12
14. Which of the following elements are the most reactive (Meaning it tends to bond with other atoms?)
a. Neon
b. Argon
c. Chlorine
d. Helium
15. How old is every atom in this universe?
a. 250,000 years old
b. 1 million years old
c. 4.6 billion years old
d. 15 billion years old
True of False. If the statement is false change the bolded answer to the correct answer.
16. The central core of the atom is called the hub
17. Elements arranged in vertical columns in the periodic table are called periods
18. The atoms in a liquid have less kinetic energy than gases.
19. The maximum number of electrons in the second energy level of an atom is 4
20. The reaction between citric acid and water is exothermic.
21. All atoms are in constant motion (meaning the kinetic energy is never 0).
22. Molecules are composed of at least 2 atoms.
Draw the Lewis Structure and write the formulas for the following chemical compounds.
23. Sodium chloride
24. Calcium Sulfide
25. Potassium Bromide
26. Magnesium Iodide
27. Lithium Oxide
Draw the Lewis Structure and write the name of the chemical compound for the following formulas.
28. CO2
29. SO2
30. AlBr3
31. Na2S
32. Li2O
Identify each reaction as synthesis, decomposition, single replacement, or double replacement.
33. Na3PO4 + 3 KOH  3 NaOH + K3PO4
34. MgCl2 + Li2CO3  MgCO3 + 2 LiCl
35. CaCO3  CaO + CO2
36. O3  O. + O2
37. 2 C5H5 + Fe  Fe(C5H5)2
38. Pb + FeSO4  PbSO4 + Fe
Answer the following conservation of mass questions.
39. How many grams of methane (CH4) need to be combined with 64g of
oxygen to produce 44g of carbon dioxide and 36g of water?
40. When 245.3g of potassium chlorate is heated it decomposes into
potassium, chlorine and oxygen. If 78g of potassium and 71.5g of
chlorine are massed, how much oxygen is produced?
Short answer.
1. How does kinetic energy relate to states of matter?
2. What is meant by the phrase “mass is conserved”? Give an example of a reaction where mass changes form but is
conserved.
3. Can you dissolve more sugar or salt in water that is heated to 50 degrees C? Why?